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Fuels and Combustion

Fuels and Combustion
Gobar gas is produced by the __________ of cown dung.

Oxidation
Hydrogenation
None of these
Fermentation

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Fuels and Combustion
Micum Index of a coke is a measure of its

Hardness & strength
Reactivity
Porosity
Bulk density

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Fuels and Combustion
Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?

High power consumption in its transportation
Excessive fly-ash discharge from the stack
Ash disposal problem
Erosion of induced draft fan blades

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Fuels and Combustion
Which of the following coal gasification processes will produce gas having maximum methane content?

Lurgi process
Winkler process
Kopper-Totzek process
All of these

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Fuels and Combustion
Blast furnace gas compared to coke oven gas has

Narrower limit of inflammability
Lower ignition temperature
Lower theoretical flame temperature
Higher calorific value

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Fuels and Combustion
In Lurgi coal gasifier,

Entrainment of solids is higher
Low carbon conversion efficiency is achieved
Larger quantity of coal can be processed
Coking coals cannot be used

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